A few more excerpts from Yomiuri Shimbun follow, attributed to Hitoshi Nishiwake, Matsuo Corporation's President. "We knead a thick concrete in a mixer, put it into molds, press and vibrate it into shape and then remove it from the molds quickly. The entire process--called vibration concrete molding--is done automatically by machine..." "As our concrete is thick, water-retaining voids remain in the finished product," he said..."According to the size of voids, the blocks become either water-permeable or water-retentive".
"Water-retentive blocks are as strong as ordinary blocks and strong enough to bear the weight of vehicles. They can be used anywhere. And with their capacity for retaining water, they can be used as vegetation blocks, too."
He said: "We've worked with used and recycled materials for a long time. I personally inherited the spirit of "mottainai" [literally: "It's a shame to waste things."] from my ancestors. As global warming progresses, we'll take a natural approach to conserve the global environment and continue contributing to it company-wide in the future."